Massachusetts Gov. Charlie Baker and Boston Mayor Marty Walsh joined dozens of others for simple and somber wreath-laying ceremonies to remember the victims of the 2013 Boston Marathon bombing on Friday.

Baker and Walsh joined victims' families and survivors in wreath-laying ceremonies Friday morning where the bombs went off on Boylston Street.

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Baker joined the family of Krystle Campbell to lay a wreath at one blast site at Marathon Sports. Walsh was present when the fathers of Martin Richard and Lingzi Lu placed a wreath outside the former Forum Restaurant.

They were surrounded by those who survived the bombing, including Bill White, the oldest amputee, and Jane Richard, the youngest.

"It’s always a sad day remembering the people we lost three years ago and how all of our lives were affected," Abbott said.

Heroes from the day, including Carlos Arredondo and Shane O'Hara, were also in attendance.

"Three years after this terrible tragedy happened, we are back here at the same site and we are seeing the resiliency among the families of the victims, as well as the survivors," Arredondo said.

"I have my own foundation, The Heather Abbott Foundation, and so many businesses have reached out here in Boston to support us and donated proceeds to the foundation which was wonderful. I love the idea of One Boston Day," Abbott said.

A moment of silence will be held at 2:49 p.m. at City Hall Plaza.

"It’s very emotional. It’s been three years since all this happened. We can see the resiliency of the survivors and the victims’ families," Arredondo said.

The spirit of One Boston Day is also being honored on Copley Square with a blood drive organized by a young marathon bombing survivor.

Gillian Reny was still in high school when she was seriously injured in the bombings.

She and her family have turned the event into something positive by establishing the Stepping Strong Fund, which raises money for trauma care and research.

The family and fund are holding a blood drive from 9 a.m. to 3 p.m. Friday on Boylston Street. Organizers said all the appointments for Friday were filled, but those still wanting to donate blood do so by visiting the Kraft Family Blood Donor Center located in the Jimmy Fund Building at 35 Binney St. in Boston, calling 617-632-3206 or by emailing blooddonor@partners.org.

Reny said helping others with the fund has helped her and her family find some healing.